I don't mean to contradict REN69, but I was always told that it was good to replace the fuel filter in shorter intervals, especially the way the gas is today (apparently much dirtier than it used to be).
On my old 4Runner, the fuel filter got old and plugged, so much so that it caused too much draw on the fuel pump. So instead of paying the 15 bucks for a fuel filter, I ended up paying about 400 for a pump
BUT, that's only on EFI systems. I'm not sure that it would have so much impact if the fuel pump is mechanical.